Does the hvv Any App have to remain switched on during the entire period of use?

Yes, when using hvv Any, the app must run without interruption and must not be closed, otherwise no data can be recorded for the calculation of the journey. This does not mean that the screen must be switched on the entire time or that no other apps can be used on your smartphone while you are using hvv Any. It is just that the hvv Any app must not be closed. If the app is not active for too long (max. 2 minutes), your driving authorisation will be revoked.